In this thesis are shown a number of useful value phacelia as culture, but also to describe its morphological, biological, environmental and other features based on data from the literature. Phacelia is a hardy crop that is perceived as a weed species, but because of its beneficial properties is increasingly grown as a cultural type. It is among the most important types of honey and is an important source of nectar and pollen. It is grown for green manure to improve soil quality, but also enriches the soil with organic material. It can be used as a forage crop for the possibility of production and feeding. Use protective crops to protect soil, but also to combat weeds. Breeds may be for the production of green forage, silage and hay. It is useful on the ground which is susceptible to erosion as well covers and protects the soil. Furthermore, phacelia has proven to be a plant that cleans the soil of nematodes. It is among the best honey types, and is an excellent bee pasture. It has many medicinal properties and a different purpose. Because of its appearance and has decorative value. Due to the high share of nectar and pollen is important to feed beneficial insects. In practice, it is usually combined use of such honey and protective culture (Svečnjak, 2007). In the beginning of the growing season comes to the appearance of weeds in the crop phacelia. Weed species can pose a big problem for crop phacelia, but many of them have a use value, but can be very useful. At Faculty of Agriculture in experiment on Maksimir, an analysis of the use value of weed species in the crop phacelia.